Pregled bibliografske jedinice broj: 121064
QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi
QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi // Physics letters. B, 571 (2003), 3-4; 75-84 doi:10.1016/j.physletb.2003.08.012 (međunarodna recenzija, članak, znanstveni)
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Naslov
QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi
Autori
Khodjamirian, A. ; Mannel, T. ; Melić, Blaženka
Izvornik
Physics letters. B (0370-2693) 571
(2003), 3-4;
75-84
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
N/A
Sažetak
Employing the QCD light-cone sum rule approach we calculate the B -> pi pi hadronic matrix element of the current-current operator with c quarks in the penguin topology (``charming penguin''). The dominant contribution to the sum rule is due to the c-quark loop at short distances and is of O(alpha_s) with respect to the factorizable B -> pi pi amplitude. The effects of soft gluons are suppressed at least by O(alpha_s m_b^{; ; ; ; -2}; ; ; ; ). Our result indicates that sizable nonperturbative effects generated by charming penguins at finite m_b are absent. The same is valid for the penguin contractions of the current-current operators with light quarks.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
POVEZANOST RADA
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
